<template>
<div id="login">
  <div class="loginInner">
    <div class="login_header">
      <h2 class="login_logo">用户登录</h2>
      <div class="login_header_title">
        <a href="javascript:;" :class="{on: loginWay}" @click="loginWay=true">短信登录</a>
        <a href="javascript:;" :class="{on: !loginWay}" @click="loginWay=false">密码登录</a>
      </div>
    </div>
    <div class="login_content">
      <form @submit.prevent="login">
        <div :class="{on: loginWay}">
          <section class="login_message">
            <input type="tel" maxlength="11" placeholder="手机号" v-model="phone">
            <button :disabled="!rightPhone" class="get_verification"
                    :class="{right_phone: rightPhone}" @click.prevent="getCode">
              {{computeTime>0 ? `已发送(${computeTime}s)` : '获取验证码'}}
            </button>
          </section>
          <section class="login_verification">
            <input type="tel" maxlength="6" placeholder="验证码" v-model="code">
          </section>
          <section class="login_hint">
            温馨提示：未注册帐号的手机号，登录时将自动注册，且代表已同意
            <a href="javascript:;">《用户服务协议》</a>
          </section>
        </div>
        <div :class="{on: !loginWay}">
          <section>
            <section class="login_message">
              <input type="text" maxlength="11" placeholder="手机/邮箱/用户名" v-model="name">
            </section>
            <section class="login_verification">
              <input type="text" maxlength="8" placeholder="密码" v-if="showPwd" v-model="pwd">
              <input type="password" maxlength="8" placeholder="密码" v-else v-model="pwd">
              <div class="switch_button" :class="showPwd?'on':'off'" @click="showPwd=!showPwd">
                <div class="switch_circle" :class="{right: showPwd}"></div>
                <span class="switch_text">{{showPwd ? '' : ''}}</span>
              </div>
            </section>
            <section class="login_message">
              <input type="text" maxlength="6" placeholder="验证码" v-model="captcha">
              <img class="get_verification" src="http://localhost:4000/captcha" alt="captcha"
                   @click="getCaptcha" ref="captcha">
            </section>
          </section>
        </div>
        <button class="login_submit">登录</button>
      </form>
    </div>
    <AlertTip :alertText="alertText" v-show="alertShow" @closeTip="closeTip"/>
  </div>

</div>
</template>

<script>
  import AlertTip from './AlertTip'
  import {reqSendCode, reqSmsLogin, reqPwdLogin} from '../api'
    export default {
      name: "login",
      data () {
        return {
          loginWay: false, // true代表短信登陆, false代表密码登录
          computeTime: 0, // 计时的时间
          showPwd: false, // 是否显示密码
          phone: '', // 手机号
          code:'', // 短信验证码
          name: '', // 用户名
          pwd: '', // 密码
          captcha: '', // 图形验证码
          alertText: '', // 提示文本
          alertShow: false, // 是否显示警告框
        }
      },
      computed: {
        rightPhone () {
          return /^1\d{10}$/.test(this.phone)
        }
      },

      methods: {
        // 异步获取短信验证码
        async getCode () {
          // 如果当前没有计时
          if(!this.computeTime) {
            // 启动倒计时
            this.computeTime = 60
            this.intervalId = setInterval(() => {
              this.computeTime--
              if(this.computeTime<=0) {
                // 停止计时
                clearInterval(this.intervalId)
              }
            }, 1000)

            // 发送ajax请求(向指定手机号发送验证码短信)
            const result = await reqSendCode(this.phone)
            if(result.code===1) {
              // 显示提示
              this.showAlert(result.msg)
              // 停止计时
              if(this.computeTime) {
                this.computeTime = 0
                clearInterval(this.intervalId)
                this.intervalId = undefined
              }
            }
          }

        },

        showAlert(alertText) {
          this.alertShow = true
          this.alertText = alertText
        },
        // 异步登陆
        async login () {
          let result
          // 前台表单验证
          if(this.loginWay) {  // 短信登陆
            const {rightPhone, phone, code} = this
            if(!this.rightPhone) {
              // 手机号不正确
              this.showAlert('手机号不正确')
              return
            } else if(!/^\d{6}$/.test(code)) {
              // 验证必须是6位数字
              this.showAlert('验证必须是6位数字')
              return
            }
            // 发送ajax请求短信登陆
            result = await reqSmsLogin(phone, code)

          } else {// 密码登陆
            const {name, pwd, captcha} = this
            if(!this.name) {
              // 用户名必须指定
              this.showAlert('用户名必须指定')
              return
            } else if(!this.pwd) {
              // 密码必须指定
              this.showAlert('密码必须指定')
              return
            } else if(!this.captcha) {
              // 验证码必须指定
              this.showAlert('验证码必须指定')
              return
            }
            // 发送ajax请求密码登陆
            result = await reqPwdLogin({name, pwd, captcha})
          }

          // 停止计时
          if(this.computeTime) {
            this.computeTime = 0
            clearInterval(this.intervalId)
            this.intervalId = undefined
          }

          // 根据结果数据处理
          if(result.code===0) {
            const user = result.data
            // 将user保存到vuex的state
            console.log(user)
            this.$store.dispatch('recordUser', user)

            //设置Vuex登录标志为true，默认userLogin为false
            this.$store.dispatch("userLogin", true);
            //Vuex在用户刷新的时候userLogin会回到默认值false，所以我们需要用到HTML5储存
            //我们设置一个名为Flag，值为isLogin的字段，作用是如果Flag有值且为isLogin的时候，证明用户已经登录了。
            sessionStorage.setItem("Flag", "isLogin");
            // 登录首页
            this.$router.replace('/home')
          } else {
            // 显示新的图片验证码
            this.getCaptcha()
            // 显示警告提示
            const msg = result.msg
            this.showAlert(msg)
          }
        },
        // 关闭警告框
        closeTip () {
          this.alertShow = false
          this.alertText = ''
        },
        // 获取一个新的图片验证码
        getCaptcha () {
          // 每次指定的src要不一样
          this.$refs.captcha.src = 'http://localhost:4000/captcha?time='+Date.now()
        }
      },
      components: {
        AlertTip
      }

    }
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
  @import "../common/stylus/mixins.styl"
  #login
    width 100%
    height 100%
    background #fff
    .loginInner
      padding-top 60px
      width 80%
      margin 0 auto
      .login_header
        .login_logo
          font-size 40px
          font-weight bold
          color #409EFF
          text-align center
        .login_header_title
          padding-top 40px
          text-align center
          >a
            color #333
            font-size 14px
            padding-bottom 4px
            text-decoration none
            &:first-child
              margin-right 40px
            &.on
              color #409EFF
              font-weight 700
              border-bottom 2px solid #409EFF
      .login_content
        >form
          >div
            display none
            &.on
              display block
            input
              width 100%
              height 100%
              padding-left 10px
              box-sizing border-box
              border 1px solid #ddd
              border-radius 4px
              outline 0
              font 400 14px Arial
              &:focus
                border 1px solid #409EFF
            .login_message
              position relative
              margin-top 16px
              height 48px
              font-size 14px
              background #fff
              .get_verification
                position absolute
                top 50%
                right 10px
                transform translateY(-50%)
                border 0
                color #ccc
                font-size 14px
                background transparent
                &.right_phone
                  color black
            .login_verification
              position relative
              margin-top 16px
              height 48px
              font-size 14px
              background #fff
              .switch_button
                font-size 12px
                border 1px solid #ddd
                border-radius 8px
                transition background-color .3s,border-color .3s
                padding 0 6px
                width 30px
                height 16px
                line-height 16px
                color #fff
                position absolute
                top 50%
                right 10px
                transform translateY(-50%)
                &.off
                  background #fff
                  .switch_text
                    float right
                    color #ddd
                &.on
                  background #409EFF
                >.switch_circle
                  position absolute
                  top -1px
                  left -1px
                  width 16px
                  height 16px
                  border 1px solid #ddd
                  border-radius 50%
                  background #fff
                  box-shadow 0 2px 4px 0 rgba(0,0,0,.1)
                  transition transform .3s
                  &.right
                    transform translateX(30px)
            .login_hint
              margin-top 12px
              color #999
              font-size 14px
              line-height 20px
              >a
                color #409EFF
                text-decoration none
          .login_submit
            display block
            width 100%
            height 42px
            margin-top 30px
            border-radius 4px
            background #409EFF
            color #fff
            text-align center
            font-size 16px
            line-height 42px
            border 0

</style>
